| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.view; |
| |
| import android.graphics.Canvas; |
| import android.os.Handler; |
| import android.os.Message; |
| import android.widget.FrameLayout; |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.content.res.XmlResourceParser; |
| import android.util.AttributeSet; |
| import android.util.Xml; |
| |
| import java.io.IOException; |
| import java.lang.reflect.Constructor; |
| import java.util.HashMap; |
| |
| /** |
| * This class is used to instantiate layout XML file into its corresponding View |
| * objects. It is never be used directly -- use |
| * {@link android.app.Activity#getLayoutInflater()} or |
| * {@link Context#getSystemService} to retrieve a standard LayoutInflater instance |
| * that is already hooked up to the current context and correctly configured |
| * for the device you are running on. For example: |
| * |
| * <pre>LayoutInflater inflater = (LayoutInflater)context.getSystemService |
| * (Context.LAYOUT_INFLATER_SERVICE);</pre> |
| * |
| * <p> |
| * To create a new LayoutInflater with an additional {@link Factory} for your |
| * own views, you can use {@link #cloneInContext} to clone an existing |
| * ViewFactory, and then call {@link #setFactory} on it to include your |
| * Factory. |
| * |
| * <p> |
| * For performance reasons, view inflation relies heavily on pre-processing of |
| * XML files that is done at build time. Therefore, it is not currently possible |
| * to use LayoutInflater with an XmlPullParser over a plain XML file at runtime; |
| * it only works with an XmlPullParser returned from a compiled resource |
| * (R.<em>something</em> file.) |
| * |
| * @see Context#getSystemService |
| */ |
| public abstract class LayoutInflater { |
| private final boolean DEBUG = false; |
| |
| /** |
| * This field should be made private, so it is hidden from the SDK. |
| * {@hide} |
| */ |
| protected final Context mContext; |
| |
| // these are optional, set by the caller |
| private boolean mFactorySet; |
| private Factory mFactory; |
| private Factory2 mFactory2; |
| private Factory2 mPrivateFactory; |
| private Filter mFilter; |
| |
| final Object[] mConstructorArgs = new Object[2]; |
| |
| static final Class<?>[] mConstructorSignature = new Class[] { |
| Context.class, AttributeSet.class}; |
| |
| private static final HashMap<String, Constructor<? extends View>> sConstructorMap = |
| new HashMap<String, Constructor<? extends View>>(); |
| |
| private HashMap<String, Boolean> mFilterMap; |
| |
| private static final String TAG_MERGE = "merge"; |
| private static final String TAG_INCLUDE = "include"; |
| private static final String TAG_1995 = "blink"; |
| private static final String TAG_REQUEST_FOCUS = "requestFocus"; |
| |
| /** |
| * Hook to allow clients of the LayoutInflater to restrict the set of Views that are allowed |
| * to be inflated. |
| * |
| */ |
| public interface Filter { |
| /** |
| * Hook to allow clients of the LayoutInflater to restrict the set of Views |
| * that are allowed to be inflated. |
| * |
| * @param clazz The class object for the View that is about to be inflated |
| * |
| * @return True if this class is allowed to be inflated, or false otherwise |
| */ |
| @SuppressWarnings("unchecked") |
| boolean onLoadClass(Class clazz); |
| } |
| |
| public interface Factory { |
| /** |
| * Hook you can supply that is called when inflating from a LayoutInflater. |
| * You can use this to customize the tag names available in your XML |
| * layout files. |
| * |
| * <p> |
| * Note that it is good practice to prefix these custom names with your |
| * package (i.e., com.coolcompany.apps) to avoid conflicts with system |
| * names. |
| * |
| * @param name Tag name to be inflated. |
| * @param context The context the view is being created in. |
| * @param attrs Inflation attributes as specified in XML file. |
| * |
| * @return View Newly created view. Return null for the default |
| * behavior. |
| */ |
| public View onCreateView(String name, Context context, AttributeSet attrs); |
| } |
| |
| public interface Factory2 extends Factory { |
| /** |
| * Version of {@link #onCreateView(String, Context, AttributeSet)} |
| * that also supplies the parent that the view created view will be |
| * placed in. |
| * |
| * @param parent The parent that the created view will be placed |
| * in; <em>note that this may be null</em>. |
| * @param name Tag name to be inflated. |
| * @param context The context the view is being created in. |
| * @param attrs Inflation attributes as specified in XML file. |
| * |
| * @return View Newly created view. Return null for the default |
| * behavior. |
| */ |
| public View onCreateView(View parent, String name, Context context, AttributeSet attrs); |
| } |
| |
| private static class FactoryMerger implements Factory2 { |
| private final Factory mF1, mF2; |
| private final Factory2 mF12, mF22; |
| |
| FactoryMerger(Factory f1, Factory2 f12, Factory f2, Factory2 f22) { |
| mF1 = f1; |
| mF2 = f2; |
| mF12 = f12; |
| mF22 = f22; |
| } |
| |
| public View onCreateView(String name, Context context, AttributeSet attrs) { |
| View v = mF1.onCreateView(name, context, attrs); |
| if (v != null) return v; |
| return mF2.onCreateView(name, context, attrs); |
| } |
| |
| public View onCreateView(View parent, String name, Context context, AttributeSet attrs) { |
| View v = mF12 != null ? mF12.onCreateView(parent, name, context, attrs) |
| : mF1.onCreateView(name, context, attrs); |
| if (v != null) return v; |
| return mF22 != null ? mF22.onCreateView(parent, name, context, attrs) |
| : mF2.onCreateView(name, context, attrs); |
| } |
| } |
| |
| /** |
| * Create a new LayoutInflater instance associated with a particular Context. |
| * Applications will almost always want to use |
| * {@link Context#getSystemService Context.getSystemService()} to retrieve |
| * the standard {@link Context#LAYOUT_INFLATER_SERVICE Context.INFLATER_SERVICE}. |
| * |
| * @param context The Context in which this LayoutInflater will create its |
| * Views; most importantly, this supplies the theme from which the default |
| * values for their attributes are retrieved. |
| */ |
| protected LayoutInflater(Context context) { |
| mContext = context; |
| } |
| |
| /** |
| * Create a new LayoutInflater instance that is a copy of an existing |
| * LayoutInflater, optionally with its Context changed. For use in |
| * implementing {@link #cloneInContext}. |
| * |
| * @param original The original LayoutInflater to copy. |
| * @param newContext The new Context to use. |
| */ |
| protected LayoutInflater(LayoutInflater original, Context newContext) { |
| mContext = newContext; |
| mFactory = original.mFactory; |
| mFactory2 = original.mFactory2; |
| mPrivateFactory = original.mPrivateFactory; |
| mFilter = original.mFilter; |
| } |
| |
| /** |
| * Obtains the LayoutInflater from the given context. |
| */ |
| public static LayoutInflater from(Context context) { |
| LayoutInflater LayoutInflater = |
| (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); |
| if (LayoutInflater == null) { |
| throw new AssertionError("LayoutInflater not found."); |
| } |
| return LayoutInflater; |
| } |
| |
| /** |
| * Create a copy of the existing LayoutInflater object, with the copy |
| * pointing to a different Context than the original. This is used by |
| * {@link ContextThemeWrapper} to create a new LayoutInflater to go along |
| * with the new Context theme. |
| * |
| * @param newContext The new Context to associate with the new LayoutInflater. |
| * May be the same as the original Context if desired. |
| * |
| * @return Returns a brand spanking new LayoutInflater object associated with |
| * the given Context. |
| */ |
| public abstract LayoutInflater cloneInContext(Context newContext); |
| |
| /** |
| * Return the context we are running in, for access to resources, class |
| * loader, etc. |
| */ |
| public Context getContext() { |
| return mContext; |
| } |
| |
| /** |
| * Return the current {@link Factory} (or null). This is called on each element |
| * name. If the factory returns a View, add that to the hierarchy. If it |
| * returns null, proceed to call onCreateView(name). |
| */ |
| public final Factory getFactory() { |
| return mFactory; |
| } |
| |
| /** |
| * Return the current {@link Factory2}. Returns null if no factory is set |
| * or the set factory does not implement the {@link Factory2} interface. |
| * This is called on each element |
| * name. If the factory returns a View, add that to the hierarchy. If it |
| * returns null, proceed to call onCreateView(name). |
| */ |
| public final Factory2 getFactory2() { |
| return mFactory2; |
| } |
| |
| /** |
| * Attach a custom Factory interface for creating views while using |
| * this LayoutInflater. This must not be null, and can only be set once; |
| * after setting, you can not change the factory. This is |
| * called on each element name as the xml is parsed. If the factory returns |
| * a View, that is added to the hierarchy. If it returns null, the next |
| * factory default {@link #onCreateView} method is called. |
| * |
| * <p>If you have an existing |
| * LayoutInflater and want to add your own factory to it, use |
| * {@link #cloneInContext} to clone the existing instance and then you |
| * can use this function (once) on the returned new instance. This will |
| * merge your own factory with whatever factory the original instance is |
| * using. |
| */ |
| public void setFactory(Factory factory) { |
| if (mFactorySet) { |
| throw new IllegalStateException("A factory has already been set on this LayoutInflater"); |
| } |
| if (factory == null) { |
| throw new NullPointerException("Given factory can not be null"); |
| } |
| mFactorySet = true; |
| if (mFactory == null) { |
| mFactory = factory; |
| } else { |
| mFactory = new FactoryMerger(factory, null, mFactory, mFactory2); |
| } |
| } |
| |
| /** |
| * Like {@link #setFactory}, but allows you to set a {@link Factory2} |
| * interface. |
| */ |
| public void setFactory2(Factory2 factory) { |
| if (mFactorySet) { |
| throw new IllegalStateException("A factory has already been set on this LayoutInflater"); |
| } |
| if (factory == null) { |
| throw new NullPointerException("Given factory can not be null"); |
| } |
| mFactorySet = true; |
| if (mFactory == null) { |
| mFactory = mFactory2 = factory; |
| } else { |
| mFactory = new FactoryMerger(factory, factory, mFactory, mFactory2); |
| } |
| } |
| |
| /** |
| * @hide for use by framework |
| */ |
| public void setPrivateFactory(Factory2 factory) { |
| mPrivateFactory = factory; |
| } |
| |
| /** |
| * @return The {@link Filter} currently used by this LayoutInflater to restrict the set of Views |
| * that are allowed to be inflated. |
| */ |
| public Filter getFilter() { |
| return mFilter; |
| } |
| |
| /** |
| * Sets the {@link Filter} to by this LayoutInflater. If a view is attempted to be inflated |
| * which is not allowed by the {@link Filter}, the {@link #inflate(int, ViewGroup)} call will |
| * throw an {@link InflateException}. This filter will replace any previous filter set on this |
| * LayoutInflater. |
| * |
| * @param filter The Filter which restricts the set of Views that are allowed to be inflated. |
| * This filter will replace any previous filter set on this LayoutInflater. |
| */ |
| public void setFilter(Filter filter) { |
| mFilter = filter; |
| if (filter != null) { |
| mFilterMap = new HashMap<String, Boolean>(); |
| } |
| } |
| |
| /** |
| * Inflate a new view hierarchy from the specified xml resource. Throws |
| * {@link InflateException} if there is an error. |
| * |
| * @param resource ID for an XML layout resource to load (e.g., |
| * <code>R.layout.main_page</code>) |
| * @param root Optional view to be the parent of the generated hierarchy. |
| * @return The root View of the inflated hierarchy. If root was supplied, |
| * this is the root View; otherwise it is the root of the inflated |
| * XML file. |
| */ |
| public View inflate(int resource, ViewGroup root) { |
| return inflate(resource, root, root != null); |
| } |
| |
| /** |
| * Inflate a new view hierarchy from the specified xml node. Throws |
| * {@link InflateException} if there is an error. * |
| * <p> |
| * <em><strong>Important</strong></em> For performance |
| * reasons, view inflation relies heavily on pre-processing of XML files |
| * that is done at build time. Therefore, it is not currently possible to |
| * use LayoutInflater with an XmlPullParser over a plain XML file at runtime. |
| * |
| * @param parser XML dom node containing the description of the view |
| * hierarchy. |
| * @param root Optional view to be the parent of the generated hierarchy. |
| * @return The root View of the inflated hierarchy. If root was supplied, |
| * this is the root View; otherwise it is the root of the inflated |
| * XML file. |
| */ |
| public View inflate(XmlPullParser parser, ViewGroup root) { |
| return inflate(parser, root, root != null); |
| } |
| |
| /** |
| * Inflate a new view hierarchy from the specified xml resource. Throws |
| * {@link InflateException} if there is an error. |
| * |
| * @param resource ID for an XML layout resource to load (e.g., |
| * <code>R.layout.main_page</code>) |
| * @param root Optional view to be the parent of the generated hierarchy (if |
| * <em>attachToRoot</em> is true), or else simply an object that |
| * provides a set of LayoutParams values for root of the returned |
| * hierarchy (if <em>attachToRoot</em> is false.) |
| * @param attachToRoot Whether the inflated hierarchy should be attached to |
| * the root parameter? If false, root is only used to create the |
| * correct subclass of LayoutParams for the root view in the XML. |
| * @return The root View of the inflated hierarchy. If root was supplied and |
| * attachToRoot is true, this is root; otherwise it is the root of |
| * the inflated XML file. |
| */ |
| public View inflate(int resource, ViewGroup root, boolean attachToRoot) { |
| if (DEBUG) System.out.println("INFLATING from resource: " + resource); |
| XmlResourceParser parser = getContext().getResources().getLayout(resource); |
| try { |
| return inflate(parser, root, attachToRoot); |
| } finally { |
| parser.close(); |
| } |
| } |
| |
| /** |
| * Inflate a new view hierarchy from the specified XML node. Throws |
| * {@link InflateException} if there is an error. |
| * <p> |
| * <em><strong>Important</strong></em> For performance |
| * reasons, view inflation relies heavily on pre-processing of XML files |
| * that is done at build time. Therefore, it is not currently possible to |
| * use LayoutInflater with an XmlPullParser over a plain XML file at runtime. |
| * |
| * @param parser XML dom node containing the description of the view |
| * hierarchy. |
| * @param root Optional view to be the parent of the generated hierarchy (if |
| * <em>attachToRoot</em> is true), or else simply an object that |
| * provides a set of LayoutParams values for root of the returned |
| * hierarchy (if <em>attachToRoot</em> is false.) |
| * @param attachToRoot Whether the inflated hierarchy should be attached to |
| * the root parameter? If false, root is only used to create the |
| * correct subclass of LayoutParams for the root view in the XML. |
| * @return The root View of the inflated hierarchy. If root was supplied and |
| * attachToRoot is true, this is root; otherwise it is the root of |
| * the inflated XML file. |
| */ |
| public View inflate(XmlPullParser parser, ViewGroup root, boolean attachToRoot) { |
| synchronized (mConstructorArgs) { |
| final AttributeSet attrs = Xml.asAttributeSet(parser); |
| Context lastContext = (Context)mConstructorArgs[0]; |
| mConstructorArgs[0] = mContext; |
| View result = root; |
| |
| try { |
| // Look for the root node. |
| int type; |
| while ((type = parser.next()) != XmlPullParser.START_TAG && |
| type != XmlPullParser.END_DOCUMENT) { |
| // Empty |
| } |
| |
| if (type != XmlPullParser.START_TAG) { |
| throw new InflateException(parser.getPositionDescription() |
| + ": No start tag found!"); |
| } |
| |
| final String name = parser.getName(); |
| |
| if (DEBUG) { |
| System.out.println("**************************"); |
| System.out.println("Creating root view: " |
| + name); |
| System.out.println("**************************"); |
| } |
| |
| if (TAG_MERGE.equals(name)) { |
| if (root == null || !attachToRoot) { |
| throw new InflateException("<merge /> can be used only with a valid " |
| + "ViewGroup root and attachToRoot=true"); |
| } |
| |
| rInflate(parser, root, attrs, false); |
| } else { |
| // Temp is the root view that was found in the xml |
| View temp; |
| if (TAG_1995.equals(name)) { |
| temp = new BlinkLayout(mContext, attrs); |
| } else { |
| temp = createViewFromTag(root, name, attrs); |
| } |
| |
| ViewGroup.LayoutParams params = null; |
| |
| if (root != null) { |
| if (DEBUG) { |
| System.out.println("Creating params from root: " + |
| root); |
| } |
| // Create layout params that match root, if supplied |
| params = root.generateLayoutParams(attrs); |
| if (!attachToRoot) { |
| // Set the layout params for temp if we are not |
| // attaching. (If we are, we use addView, below) |
| temp.setLayoutParams(params); |
| } |
| } |
| |
| if (DEBUG) { |
| System.out.println("-----> start inflating children"); |
| } |
| // Inflate all children under temp |
| rInflate(parser, temp, attrs, true); |
| if (DEBUG) { |
| System.out.println("-----> done inflating children"); |
| } |
| |
| // We are supposed to attach all the views we found (int temp) |
| // to root. Do that now. |
| if (root != null && attachToRoot) { |
| root.addView(temp, params); |
| } |
| |
| // Decide whether to return the root that was passed in or the |
| // top view found in xml. |
| if (root == null || !attachToRoot) { |
| result = temp; |
| } |
| } |
| |
| } catch (XmlPullParserException e) { |
| InflateException ex = new InflateException(e.getMessage()); |
| ex.initCause(e); |
| throw ex; |
| } catch (IOException e) { |
| InflateException ex = new InflateException( |
| parser.getPositionDescription() |
| + ": " + e.getMessage()); |
| ex.initCause(e); |
| throw ex; |
| } finally { |
| // Don't retain static reference on context. |
| mConstructorArgs[0] = lastContext; |
| mConstructorArgs[1] = null; |
| } |
| |
| return result; |
| } |
| } |
| |
| /** |
| * Low-level function for instantiating a view by name. This attempts to |
| * instantiate a view class of the given <var>name</var> found in this |
| * LayoutInflater's ClassLoader. |
| * |
| * <p> |
| * There are two things that can happen in an error case: either the |
| * exception describing the error will be thrown, or a null will be |
| * returned. You must deal with both possibilities -- the former will happen |
| * the first time createView() is called for a class of a particular name, |
| * the latter every time there-after for that class name. |
| * |
| * @param name The full name of the class to be instantiated. |
| * @param attrs The XML attributes supplied for this instance. |
| * |
| * @return View The newly instantiated view, or null. |
| */ |
| public final View createView(String name, String prefix, AttributeSet attrs) |
| throws ClassNotFoundException, InflateException { |
| Constructor<? extends View> constructor = sConstructorMap.get(name); |
| Class<? extends View> clazz = null; |
| |
| try { |
| if (constructor == null) { |
| // Class not found in the cache, see if it's real, and try to add it |
| clazz = mContext.getClassLoader().loadClass( |
| prefix != null ? (prefix + name) : name).asSubclass(View.class); |
| |
| if (mFilter != null && clazz != null) { |
| boolean allowed = mFilter.onLoadClass(clazz); |
| if (!allowed) { |
| failNotAllowed(name, prefix, attrs); |
| } |
| } |
| constructor = clazz.getConstructor(mConstructorSignature); |
| sConstructorMap.put(name, constructor); |
| } else { |
| // If we have a filter, apply it to cached constructor |
| if (mFilter != null) { |
| // Have we seen this name before? |
| Boolean allowedState = mFilterMap.get(name); |
| if (allowedState == null) { |
| // New class -- remember whether it is allowed |
| clazz = mContext.getClassLoader().loadClass( |
| prefix != null ? (prefix + name) : name).asSubclass(View.class); |
| |
| boolean allowed = clazz != null && mFilter.onLoadClass(clazz); |
| mFilterMap.put(name, allowed); |
| if (!allowed) { |
| failNotAllowed(name, prefix, attrs); |
| } |
| } else if (allowedState.equals(Boolean.FALSE)) { |
| failNotAllowed(name, prefix, attrs); |
| } |
| } |
| } |
| |
| Object[] args = mConstructorArgs; |
| args[1] = attrs; |
| return constructor.newInstance(args); |
| |
| } catch (NoSuchMethodException e) { |
| InflateException ie = new InflateException(attrs.getPositionDescription() |
| + ": Error inflating class " |
| + (prefix != null ? (prefix + name) : name)); |
| ie.initCause(e); |
| throw ie; |
| |
| } catch (ClassCastException e) { |
| // If loaded class is not a View subclass |
| InflateException ie = new InflateException(attrs.getPositionDescription() |
| + ": Class is not a View " |
| + (prefix != null ? (prefix + name) : name)); |
| ie.initCause(e); |
| throw ie; |
| } catch (ClassNotFoundException e) { |
| // If loadClass fails, we should propagate the exception. |
| throw e; |
| } catch (Exception e) { |
| InflateException ie = new InflateException(attrs.getPositionDescription() |
| + ": Error inflating class " |
| + (clazz == null ? "<unknown>" : clazz.getName())); |
| ie.initCause(e); |
| throw ie; |
| } |
| } |
| |
| /** |
| * Throw an exception because the specified class is not allowed to be inflated. |
| */ |
| private void failNotAllowed(String name, String prefix, AttributeSet attrs) { |
| throw new InflateException(attrs.getPositionDescription() |
| + ": Class not allowed to be inflated " |
| + (prefix != null ? (prefix + name) : name)); |
| } |
| |
| /** |
| * This routine is responsible for creating the correct subclass of View |
| * given the xml element name. Override it to handle custom view objects. If |
| * you override this in your subclass be sure to call through to |
| * super.onCreateView(name) for names you do not recognize. |
| * |
| * @param name The fully qualified class name of the View to be create. |
| * @param attrs An AttributeSet of attributes to apply to the View. |
| * |
| * @return View The View created. |
| */ |
| protected View onCreateView(String name, AttributeSet attrs) |
| throws ClassNotFoundException { |
| return createView(name, "android.view.", attrs); |
| } |
| |
| /** |
| * Version of {@link #onCreateView(String, AttributeSet)} that also |
| * takes the future parent of the view being constructure. The default |
| * implementation simply calls {@link #onCreateView(String, AttributeSet)}. |
| * |
| * @param parent The future parent of the returned view. <em>Note that |
| * this may be null.</em> |
| * @param name The fully qualified class name of the View to be create. |
| * @param attrs An AttributeSet of attributes to apply to the View. |
| * |
| * @return View The View created. |
| */ |
| protected View onCreateView(View parent, String name, AttributeSet attrs) |
| throws ClassNotFoundException { |
| return onCreateView(name, attrs); |
| } |
| |
| /* |
| * default visibility so the BridgeInflater can override it. |
| */ |
| View createViewFromTag(View parent, String name, AttributeSet attrs) { |
| if (name.equals("view")) { |
| name = attrs.getAttributeValue(null, "class"); |
| } |
| |
| if (DEBUG) System.out.println("******** Creating view: " + name); |
| |
| try { |
| View view; |
| if (mFactory2 != null) view = mFactory2.onCreateView(parent, name, mContext, attrs); |
| else if (mFactory != null) view = mFactory.onCreateView(name, mContext, attrs); |
| else view = null; |
| |
| if (view == null && mPrivateFactory != null) { |
| view = mPrivateFactory.onCreateView(parent, name, mContext, attrs); |
| } |
| |
| if (view == null) { |
| if (-1 == name.indexOf('.')) { |
| view = onCreateView(parent, name, attrs); |
| } else { |
| view = createView(name, null, attrs); |
| } |
| } |
| |
| if (DEBUG) System.out.println("Created view is: " + view); |
| return view; |
| |
| } catch (InflateException e) { |
| throw e; |
| |
| } catch (ClassNotFoundException e) { |
| InflateException ie = new InflateException(attrs.getPositionDescription() |
| + ": Error inflating class " + name); |
| ie.initCause(e); |
| throw ie; |
| |
| } catch (Exception e) { |
| InflateException ie = new InflateException(attrs.getPositionDescription() |
| + ": Error inflating class " + name); |
| ie.initCause(e); |
| throw ie; |
| } |
| } |
| |
| /** |
| * Recursive method used to descend down the xml hierarchy and instantiate |
| * views, instantiate their children, and then call onFinishInflate(). |
| */ |
| void rInflate(XmlPullParser parser, View parent, final AttributeSet attrs, |
| boolean finishInflate) throws XmlPullParserException, IOException { |
| |
| final int depth = parser.getDepth(); |
| int type; |
| |
| while (((type = parser.next()) != XmlPullParser.END_TAG || |
| parser.getDepth() > depth) && type != XmlPullParser.END_DOCUMENT) { |
| |
| if (type != XmlPullParser.START_TAG) { |
| continue; |
| } |
| |
| final String name = parser.getName(); |
| |
| if (TAG_REQUEST_FOCUS.equals(name)) { |
| parseRequestFocus(parser, parent); |
| } else if (TAG_INCLUDE.equals(name)) { |
| if (parser.getDepth() == 0) { |
| throw new InflateException("<include /> cannot be the root element"); |
| } |
| parseInclude(parser, parent, attrs); |
| } else if (TAG_MERGE.equals(name)) { |
| throw new InflateException("<merge /> must be the root element"); |
| } else if (TAG_1995.equals(name)) { |
| final View view = new BlinkLayout(mContext, attrs); |
| final ViewGroup viewGroup = (ViewGroup) parent; |
| final ViewGroup.LayoutParams params = viewGroup.generateLayoutParams(attrs); |
| rInflate(parser, view, attrs, true); |
| viewGroup.addView(view, params); |
| } else { |
| final View view = createViewFromTag(parent, name, attrs); |
| final ViewGroup viewGroup = (ViewGroup) parent; |
| final ViewGroup.LayoutParams params = viewGroup.generateLayoutParams(attrs); |
| rInflate(parser, view, attrs, true); |
| viewGroup.addView(view, params); |
| } |
| } |
| |
| if (finishInflate) parent.onFinishInflate(); |
| } |
| |
| private void parseRequestFocus(XmlPullParser parser, View parent) |
| throws XmlPullParserException, IOException { |
| int type; |
| parent.requestFocus(); |
| final int currentDepth = parser.getDepth(); |
| while (((type = parser.next()) != XmlPullParser.END_TAG || |
| parser.getDepth() > currentDepth) && type != XmlPullParser.END_DOCUMENT) { |
| // Empty |
| } |
| } |
| |
| private void parseInclude(XmlPullParser parser, View parent, AttributeSet attrs) |
| throws XmlPullParserException, IOException { |
| |
| int type; |
| |
| if (parent instanceof ViewGroup) { |
| final int layout = attrs.getAttributeResourceValue(null, "layout", 0); |
| if (layout == 0) { |
| final String value = attrs.getAttributeValue(null, "layout"); |
| if (value == null) { |
| throw new InflateException("You must specifiy a layout in the" |
| + " include tag: <include layout=\"@layout/layoutID\" />"); |
| } else { |
| throw new InflateException("You must specifiy a valid layout " |
| + "reference. The layout ID " + value + " is not valid."); |
| } |
| } else { |
| final XmlResourceParser childParser = |
| getContext().getResources().getLayout(layout); |
| |
| try { |
| final AttributeSet childAttrs = Xml.asAttributeSet(childParser); |
| |
| while ((type = childParser.next()) != XmlPullParser.START_TAG && |
| type != XmlPullParser.END_DOCUMENT) { |
| // Empty. |
| } |
| |
| if (type != XmlPullParser.START_TAG) { |
| throw new InflateException(childParser.getPositionDescription() + |
| ": No start tag found!"); |
| } |
| |
| final String childName = childParser.getName(); |
| |
| if (TAG_MERGE.equals(childName)) { |
| // Inflate all children. |
| rInflate(childParser, parent, childAttrs, false); |
| } else { |
| final View view = createViewFromTag(parent, childName, childAttrs); |
| final ViewGroup group = (ViewGroup) parent; |
| |
| // We try to load the layout params set in the <include /> tag. If |
| // they don't exist, we will rely on the layout params set in the |
| // included XML file. |
| // During a layoutparams generation, a runtime exception is thrown |
| // if either layout_width or layout_height is missing. We catch |
| // this exception and set localParams accordingly: true means we |
| // successfully loaded layout params from the <include /> tag, |
| // false means we need to rely on the included layout params. |
| ViewGroup.LayoutParams params = null; |
| try { |
| params = group.generateLayoutParams(attrs); |
| } catch (RuntimeException e) { |
| params = group.generateLayoutParams(childAttrs); |
| } finally { |
| if (params != null) { |
| view.setLayoutParams(params); |
| } |
| } |
| |
| // Inflate all children. |
| rInflate(childParser, view, childAttrs, true); |
| |
| // Attempt to override the included layout's android:id with the |
| // one set on the <include /> tag itself. |
| TypedArray a = mContext.obtainStyledAttributes(attrs, |
| com.android.internal.R.styleable.View, 0, 0); |
| int id = a.getResourceId(com.android.internal.R.styleable.View_id, View.NO_ID); |
| // While we're at it, let's try to override android:visibility. |
| int visibility = a.getInt(com.android.internal.R.styleable.View_visibility, -1); |
| a.recycle(); |
| |
| if (id != View.NO_ID) { |
| view.setId(id); |
| } |
| |
| switch (visibility) { |
| case 0: |
| view.setVisibility(View.VISIBLE); |
| break; |
| case 1: |
| view.setVisibility(View.INVISIBLE); |
| break; |
| case 2: |
| view.setVisibility(View.GONE); |
| break; |
| } |
| |
| group.addView(view); |
| } |
| } finally { |
| childParser.close(); |
| } |
| } |
| } else { |
| throw new InflateException("<include /> can only be used inside of a ViewGroup"); |
| } |
| |
| final int currentDepth = parser.getDepth(); |
| while (((type = parser.next()) != XmlPullParser.END_TAG || |
| parser.getDepth() > currentDepth) && type != XmlPullParser.END_DOCUMENT) { |
| // Empty |
| } |
| } |
| |
| private static class BlinkLayout extends FrameLayout { |
| private static final int MESSAGE_BLINK = 0x42; |
| private static final int BLINK_DELAY = 500; |
| |
| private boolean mBlink; |
| private boolean mBlinkState; |
| private final Handler mHandler; |
| |
| public BlinkLayout(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| mHandler = new Handler(new Handler.Callback() { |
| @Override |
| public boolean handleMessage(Message msg) { |
| if (msg.what == MESSAGE_BLINK) { |
| if (mBlink) { |
| mBlinkState = !mBlinkState; |
| makeBlink(); |
| } |
| invalidate(); |
| return true; |
| } |
| return false; |
| } |
| }); |
| } |
| |
| private void makeBlink() { |
| Message message = mHandler.obtainMessage(MESSAGE_BLINK); |
| mHandler.sendMessageDelayed(message, BLINK_DELAY); |
| } |
| |
| @Override |
| protected void onAttachedToWindow() { |
| super.onAttachedToWindow(); |
| |
| mBlink = true; |
| mBlinkState = true; |
| |
| makeBlink(); |
| } |
| |
| @Override |
| protected void onDetachedFromWindow() { |
| super.onDetachedFromWindow(); |
| |
| mBlink = false; |
| mBlinkState = true; |
| |
| mHandler.removeMessages(MESSAGE_BLINK); |
| } |
| |
| @Override |
| protected void dispatchDraw(Canvas canvas) { |
| if (mBlinkState) { |
| super.dispatchDraw(canvas); |
| } |
| } |
| } |
| } |
